| 摘要 |
A muffler assembly (10) for use with internal combustion engines discharging hot exhaust gases. The muffler assembly includes an elongated casing (15) having an inlet opening (12) at one end and an outlet opening (13) at an opposite end. A sound attenuating partition assembly including a conically converging, perforated, dispersion shell (33) and a transverse wall (45) are provided inside the muffler casing (15). The dispersion shell (33) tapers inwardly by an amount resulting a cross sectional area (A3) between the dispersion shell (33) and casing (15) at the transverse wall (45) which is at least equal to the area (A1) of the inlet opening (12). The combined area (A4) of the perforations (46) in the dispersion shell (33) upstream of the transverse wall (45) also is at least about equal to the area (A1) of the inlet opening (12). A perforated retaining shell (17) is provided positioned internally of the casing radially outwardly of the dispersion shell (33). An outer fiberglass layer of material (20) is positioned in the cavity (18) between the casing wall (15) and the retaining shell (17), and an inner ceramic layer of thermally insulating material (21) is positioned in the cavity (18) to thermally insulate the fiberglass layer (20) from the hot exhaust gases.
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